Deliberately leaving details out of a piece of writing is called

A. Hyperbole

B. Parody

C. Omission

D. Diction

C. Omission

When something is omitted it is left out. An omission is deliberately leaving details out of a piece of writing. Often we see the word omission used in the phrase "a lie of omission." A lie of omission is when a person is purposefully not telling the whole truth knowing that it is the information someone is looking for.

A parody is a copy of another's work with exaggeration to create humor. A hyperbole is an over exaggeration. Diction is the author's choice or words.

So the said question wants to choose among the following choices that could support and complete the sentence in your question about details and writing, base on the question, my answer would be letter C. Omission. I hope you are satisfied with my answer and feel free to ask for more if you have question and clarification